Grinding machine steady rest



April 1947. H. A. SlLVEN GRINDING MACHINE- STEADY REST Filed March 17,1945 4 Sheets-Sheet; 1

r gvwmm HERBERT A. SILVEN GRINDING MACHINE- STEADY REST Filed-March 1 7,194s 4 Sheets-Sheet 2 I I t s F I 4 \J an HERBERT A. \SILVEN A ril 15,1947. H. A. slLvEN ,419, 7

GRINDING MACHINE-STEADY REST 4 Sheets-Sheet 3 Filed March 17,- 1945awe/WM HERBERT A. SILVEN A ri 15, 1947. H, EN 2,419,170

GRINDING MACHINE-STEADY REST Filed March 17, 1945 4 Sheets-Sheet 4gvvuwvbo'b HERBERT A. Saws/v- WW Wk W a spring Patented Apr. 15, 19472,419,170 GRINDING MACHINE STEADY REST Herbert A. Silven, Worcester,Mass., assignor to Norton Company, Worcester, Mass, a corporation ofMassachusetts Application March 1'7, 194.5,Se1'ialNo. 583,187

13 Claims.

The invention relates to grinding machines, and more particularly to asteadyrest for supporting and steadying a work piece during a grindingoperation.

One object of the invention is to provide a simple and thoroughlypractical steadyrest for a cylindrical grinding machine. of theinvention is to provide a steadyrest which may be rapidly and readilymoved to and from an operative position.

Another object of the invention is to provide a two-bearing shoe typesteadyrest which is pivotally mounted and arranged so that it may beswung to and from an operating position to facilitate a longitudinalindexing movement of the work table or steadyrest relative to acrankshaft or the like. Another object of the invention is to; provide asteadyrest in which the bearing shoes are pivotally mounted so that theymay be swung to and from an operative position by means of a fluidpressure actuating mechanism so that the shoes may be removed to a pointremote from the work piece to facilitate indexing of the work piecerelative thereto.

Another object of the invention is to provide a steadyrest in which thesteadyrest shoes are automatically advanced and maintained in operativeengagementwith the work during grindin Another object of the inventionis to provide automatic means to retract the steadyrest shoes after agrinding operation has been completed.

Another object of the invention is to provide a spring-{actuated meansfor automatically advancing a steadyrest shoe and maintaining it inoperative engagement with the work during grinding. Another object ofthe invention is to provide a hydraulically operated mechanismautomatically to return the steadyrest shoes to their initial positionafter a grinding oteration has been completed.

Another object of the invention is to provide a steadyrest of thetwo-bearing shoe type in which a pair of independent nut and screwmechanisms are provided for adjusting the shoes to maintain them in thedesired steadying engagement with the work during a grinding operation.Another object of the invention is to provide a steadyrest with a nutand screw adjusting mechanism for the steadyrest shoes which is springactuated automatically to advance the shoes to maintain them inoperative engagement with the work piece as it is being ground.

Another object of the invention is to provide actuated mechanism formaintaining the work steadying shoes in operative contact with Anotherobject the work piece as it is ground away, combined with ahydraulically operated mechanism for returning the shoes to theirinitial position after a grinding operation has been completed. Otherobjects will be in part obviousor in part pointed out hereinafter. J

The invention accordingly consists in the features of construction,combinations of elements, and arrangements of parts, as will beexemplified in the structure to (be hereinafter described, and the scopeof the application of which will be indicated in the following claims.

In; the accompanying drawings in which is shown one of various possibleembodiments of the mechanical features of this invention,

Fig. 1 is a side elevation of the improved steadyrest;

Fig. 2-is a front elevation of the steadyrest shown in Fi 1;

Fig. 3 is a plan view, on an enlarged scale, of the improved steadyrest;

Fig. 4 is a fragmentary vertical sectional view, on an enlarged scale,taken approximately on the line 4-4 of Fig. 1;

Fig. 5 is a fragmentary vertical sectional view,

- on an enlarged scale, taken approximately on the line 5-5 of Fig. 1;

Fig. 6 is a vertical sectional view, on an enlarged scale, takenapproximately on the line 6-6 of Fig. 1, showing the spring and fluidpressure mechanism for actuating the steadyrest shoes;

Fig. 7 is a fragmentary horizontal sectional view, on an enlarged scale,taken approximately on the line 1-1 of Fig. 1, showing the adjustingmechanism for the horizontal work steadying shoe;

Fig. 8 is a fragmentary cross-sectional view, taken approximately on theline 8-8 of Fig. 6;

Fig. 9 is a fragmentary front elevation, on an enlarged scale, of thesteadyrest; I

v Fig. 10 is a fragmentary side elevation of the mechanism shown in Fig.9;

Fig. 11 is a detail view of knobs; and

Fig. 12 is a diagrammatic illustration of a modified construction inwhich fluid under pressure serves to advance the steadyrest shoes.

A steadyrest has been illustrated in the drawings mounted upon agrinding machine table 10 which is arranged for a longitudinallyreciprocatory movement relative to the base of the machine, as is oldand well known in the prior art. The improved steadyrest is particularlyadapted foruse on a crankshaft grinding machine such as, for example,that shown in the the shoe actuating prior U. S. patent to Herbert A.Silven, No. 2,151,666, dated March 21, 1939. In a machine of this typethe steadyrest is automatically located on the machine table and isarran ed so that it may be positioned opposite the operative face of arotatable transversely movable grinding Wheel ll so that the steadyrestshoes will support and steady a'workpiece, such as a'pin12of acrankshaft to be ground. The steadyre'st frame together with thesteadyrest shoes are arranged so that they may be readily moved to andfrom an operative position so that after one'pin on the crankshaft hasbeen ground, the steadyrest may be readily movedlongitudinally"relative"to the table to position it in supportingengagemnt'with another crankpin after the crankpin has been positionedin operative relationwith the gri-nding wheel H.

A steadyrest base I5 is provided which'may' be readily clamped inposition on the work sup-- "p'oitiiig' table ID The under surface'of the"st'eadyr'e'st is provided with "supporting bearing "surfaces 1'6, l 7,Band "i 9 which'matawith'corre- "s'pciidingly shaped surfaces on thework sup p'o'rtingtable ii]; A' clampingblock "261s 'supported on thesteadyrest frame? and serves to clamp the steady're'st base securely in'an operati ve po'sitio'n'on the table Ill.

The 'st'eadyrest ba'se 'i'5is preferably formed as "*a "hollow casing"havinga pair of' upwardly extending side plates 2-'i"'and"25' whichserve as a support and guide for apivotallymounted steady- 'rest frame26. The steadyrest frame ZB' is pivotally" supported on a stud" 21whichfis fixedly mounted flo'nthe nae plates *24 "and '25 of the isteadyrest base I 5.

The steadyrest frame 26 serves as"'a"'support "forapair'ofwork"steadyingshoes'n and 29. The steadyrest shoe 23 is preferablypositioned "and" arranged toengage the fwork pieceat a*- pointsubstantially diametrically "opposite the point of contact between" thegrinding wheel I I and the work piece l2. The 'sh'oe'28 *is mounted onthe forward end of a horizontally adjustable sIide' SU-"Which slideswithin-anaperture 'formed within' the stead'yrest' frame 26. A nut andscrew adjusting mechanism is providd for adjusting the position of-the'slide'30 'coriiprising-a manually bperablekneb 3 I which-'m oi'inted on'the outer end of anadjusting screw 32. --'I-he'- s'crew -'32--isscrew-threaded into a -thr'eaded a ertereformed -=in theslide Bil (Figsram '7) 'The adjusting rew 32 is 'rotatably supported-in the stead'yrestai hB -Z fi afid is -he1d a grairrst axial movement relativethereto-earners rotary adju stinenfl of the screw 32 is transmitted tocause a transverse -=ad-justinent of the slidetil and-the shoe 28.

The steadyrest shoe- 29 is preferably arranged *to'engage the under side'of thework piece l2 at a point adja'cent-totheline'of' contact be---tween the grinding wheel I landthe work piece 12. The shoe 26 ismounted on a support'ing-arm 33 which is' in turn pivotally' supportedon a stud 34 carried by the steadyrest frame 26.

Td-facil'itateadjustment of the arm 33, a 'trans- 'vrsely adjustableslide "member 34 is' -slidably mounted within the -frame-' '26. Theforward or "right-hand 'end offthe-slide 34 (Fig. l) is prov'ided with-a-cam face 35 engaging a' roller 36 is screuf'threaded ihto-a'threa'dedaperture in-the a linlr'ai'l.

heated by astud 58-with the right-handend of the'piston'rod59 (Fig. 1).'A piston 60 is formed 55 v disclosure that adjustment of the slide 34either toward or fromfthe wheel I l'will transmit a swinging'motion tothe arm- 33 throughthe' roller 36 so as to move the work steadying shoe29 either toward or from the surface of the work piece 12.

In ordertoattain one object of this invention, it is desirable toprovide a su table controlling -n'iecha'nism for swinging the steadyrestframe #26 toarid from an'operative position so that when in an operativeposition, the shoes 28 and 29 are in a position remote from the workpiece [2.

This mechanism may comprise a pivotally mountea'armls which is pivotallysupported on a stud 46 carried by the steadyrest base [5. The upper-elndof the=arm is provided-"witha roller 41 which 'is supported on a*"stud 43 carried by the "arm ifi "The roller 47 is arranged -toengage-a plane surface 39 formed on thestea'dyrest frame 26.*Inordertomaintain the frame 26 in'a-predetermined relationship with thearm 45 during movement-to and from an operative position,

the "stud43 which supports theroller 4'! is *provided with two outwardlyextending 'pinsor studs 50 and 5d (Fig. 4) which 'slide-within' slots 52and -53, respectively, formed-in opposite "side plates of'the frame 26.-An adjustable stop screw 54 is provided on the steadyrest-basemmberprecisely to'locate the-steadyrest frame 26 when inarr-operative position.

It will be readily apparent from the foregoing disclosure that if thearm 45 is swung-in a' coun- --terclockwise direction, the roller 4 Twillrun along the surface 4% andthepi-ns Sir-and 51' riding with- 40 in'thegrooves 52 and 53, respectively? will cause the frame 26 'to swingdownw'ardly'in a' clockwise direction (Fig.1) to aninoperative position26a,

' as shown in-dotted lin'es'lin-Fig; l, withthe work steadying shoes 28'and '29 assuining dottd' line positions 28a a1'iol 29a.

To facilitate'movem'ent of the steadyre'st frame '26*to and:fromanpperative position, a fluid extending arm 55 which-projects'below thestud 46. The-arm 55 is connected by a-stud 56 with The other end of thelink 51 is cone'ither int'egral' withor fixedly mounted on' the leitha'rideridbf the-piston mass. The" piston Eiiiis'slidably mounted withina cylinder 6| which -'is formed integral with or fixedlyin'ounted on ithe steadyrest base j 5.

When fluid under pressurefrom a: source of 1 supply is admitted througha-pipe 62 intoa cylinder chamber 63, the: piston 69 is 'moved toward theleft into the position illustrated in Fig. 1

"with the frame 25 and thefworksteadying shoes piece' i2. When it isdesiredto move the steady- "re'st frame 26'together with theworksteadying 28 and 29 in operative engagement with the work 1 shoes-28'and 29130" an'inoperativeposition, fluid 60' to'move towardthe right(Fig. 1), which under pressure is admitted through a pipe '64 intoacylinder chamber 65 to'ca'use'the piston movement rocks the arm 45inacounterclock- "wi'se direction into dotted line rp'osition'- 45a (Fig.-l)-and swings the steadyrest frame 26=together *with'the work'steadying shoes 28 arid= 29 into the pinion dotted line positions 29a,23a and 29a shown in Fig.1. I I

In order to attain one object of the invention, it is desirable toprovide automatically operated means for actuating the adjusting screws32 and 39 so that the work steadying shoes 28 and 29 may be maintainedin operative engagement with the work piece I2 at the desired pressureasthe work is ground away during a grinding operation. In the preferredform of this invention, a combined compression spring and hydraulicmechanism is provided for turning the adjusting screws 32 and 39 toadvance the work shoes during a grinding operation and thereafter toreturn the'work shoes 28 and 29 to their initial position.

The adjusting screw 32 is provided with a gear or pinion III which isformed thereon between the knob 3| and the screw threaded portion 32.The

pinion I meshes with a rack bar II which is fixedly mounted on the upperend of a piston rod I2. A piston i3 is either formed integral with thepiston rod I2 01' is fixedly mounted thereon. The piston I3 is slidablysupported within a cylinder 14. When fluid under pressure is admittedthrough a passage into a cylinder chamber 16, it will cause an upwardmovement of the piston I3 (Fig. 6) to move the rack II upwardly andthereby cause :a counterclockwise rotation of the I0 and the adjustingscrew 32. A compression spring I1 is provided within the cylinder l4which surrounds the piston rod I2 and is interposed between the pistonI3 and the upper head of the cylinder I4. The compression of the spring'II serves normally to exert a downward pressure tending to cause adownward movement of the piston I3, which movement serves to cause a Idownward movement of the rack 'I and thereby to transmit a clockwiserotation to the pinion I0 and the screw 32. An adjustable stop screw I8is provided to limit the downward movement of the rack bar 'II and thepiston I3. A stop screw I9 is provided to limit the upward hydraulicmovement of the piston I3 and the rack bar I0 so as to limit thecounterclockwise rotation of the pinion I0 and the screw 32. 1

A similar mechanism is provided for actuating the steadyrest shoeadjusting screw 39. The screw 39 is provided with a pinion 80 whichmeshes with a rack bar 8|. The rack bar 8| is fixedly mounted on thelower end of a piston rod 82. A piston 83 is either fixedly mounted onor formed integral with the piston rod 82 and is 'slidably supportedwithin a cylinder 84. When fluid under pressure is admitted through apassage 85 into a cylinder chamber 89, it will cause a downward movementof the piston 83 which serves to rotate the pinion 80 and screw 39 in acounterclockwise direction. A compression spring 81 is provided withinthe cylinder 84 surrounding the piston rod 82 and is interposed betweenthe piston 34 and the lower head of the cylinder 84. A stop screw 88serves to limit the upward movement of the piston 83 under the influenceof the compression spring 8?. An adjustable stop screw 89 serves tolimit the downward movement of the rack bar'SI and the piston 03 so asto limit the hydraulic counterclockwise rotation of the pinion 80.

-The springs 11 and 31 are utilized to transmit a rotary motion to theadjusting screws 32 and 39 to advance the work steadying shoes 28 and 29as the work is reduced in size during grinding and serve to maintain adesired operating pressure between the shoes 28 and 23 and the workpiece I2. The hydraulically operated pistons I3 6 are utilized to rotatethe adjusting screws 32 and 39, respectively, in opposite directions to"retract the work shoes 28 and 29 to their initial position after agrinding operation has been completed. While a compression spring hasbeen illustrated for rotating the adjusting screws 32 and 39 during agrinding operation, it should be understood that these springs may beeliminated and fluid under pressure admitted through a pipe 15a into theupper chamber 160. of the cylinder I4 and through a pipe a into thelower chamber 33a of the cylinder 84 to provide an advancing movement ofthe work steadying shoes 28 and 29 under the influence of fluid underpresand 83 sure, if desired.

At the start of a grinding operation, it is desirable for the grindingwheel II to engage the periphery of the work piece I2 and grind off anyirregularities and round up the work piece before the steadyrest shoesare moved into operative enbell crank lever 30 is provided with aforwardly extending actuating arm 32. The bell crank lever is alsoprovided with an upwardly extending arm 93 which carries a stud 94. Thestud 94 is arranged in the path of a lug 95 projecting from and formedintegral with the knob 3|. 7 It will be readily apparent that the lug 95engaging the stud 94 will hold the spring I? under compression bypreventing the knob 3| from rotating in a clockwise direction. Aspring-pressed plunger96 (Fig. 10) is provided normally to urge the bellcrank lever 90 in a counterclockwise direction (Fig. 10) to maintain thestud 94 in the path of the lug 95.

When it is desired to release the compression of the spring 1Iautomatically to move the shoe 23 into operative engagement with thework piece I2, the arm 92 of the bell crank lever 90 may be movedupwardly (Fig. 9) to swing the bell crank lever 90 in a clockwisedirection (Fig. 10) so as to throw the stud 94 out of the path of thelug 95 on the knob 3|, thereby releasing the compression of the springII which automatically rotates the screw 32 to advance the work shoe 28into operative supporting and steadying engagement with the work pieceI2.

A similar latch mechanism is provided for latching the spring 81 undercompression. This mechanism comprises a bell crank lever I00 which ispivotally supported on a stud WI. The bell crank lever I00 is providedwith a forwardly extending, manually operable arm I02. The bell cranklever I00 is also'provided with a downwardly extending arm I03 whichcarries a stud I04. The stud I04 is arranged normally in the path of astop lug I05 (Figs. 1 and 10) formed integral with the knob 38. Thedetails of this stop lug I05 have not been illustrated since it isidentical to the stop lug shown on the actuating knob 3| in Fig. 11. Aspring-pressed plunger I06 normally serves to maintain the bell cranklever I00 in a position so that the stud I04 lies in the path of thestop lug (not shown) formed on the actuating knob 30. When it is desiredto release the compression of the spring 81,.the arm I02 is moveddownwardly to rockthe bell crank latch mechanism whereby the g leverI110 in a counterclockwise direction (Fig.

leases the compression of. the spring 81 and therebycauses an upwardmovement of thexrack bar 81 to transmit a clockwise rotation to thepinion 80. so as toadvance the slide 34 and thus move the workshoe 2 9into operative supporting engagement with the work piece I2 and tomaintain it incontact therewith at the desired pressure as the workpiece is reduced in size during the grinding operation.

The cylinders I4 and 84 are adjustably mounted onthe swinging frame 26.In order to supply fluid under pressure for actuating thepistons I3 and83, fluid under pressure is preferably passed through the pipe 64 intoapassage III) formed in the steadyrest base I into a groove or chamberIII formed in the periphery of the pivot stud. 21 and into an axiallyextending bore II2 formed in the pivot stud 2'I. Fromthe central boreIII fluid under pressure passes radially into a groove I I 3 formed inthe periphery of the stud 21. From thecgroove or chamber II3 surroundingthe stud 2I, fluid may pass through a passage H4 and a passage II5 whichconnects with the passage I5 to admit fluid under pressure to thecylinder chamber .26 at the .lower end of the cylinder 84. Fluid underpressure entering the chamber II3 surrounding the stud 2'! may also passthrough a passage II6 which connects with the passage 85 to admit fluidunder pressure to the cylinder chamber 86 so as to cause a downwardmovement of the piston 83'. It will thus be readily apparent from theforegoing discdosure that fluid under pressure may be readilytransmitted to the cylinders I4 and 84 in any position of the frame 26.Inorder to facilitate a manual adjustment of the work steadying shoes 28and 29 by means of actuating knobs 3| and 38, respectively, it isdesirable to provide suitable means for disconnecting. the rack bar IIfrom the pinion I0 and the rack bar 8| from the pinion 80. When the rackbars II and BI are disengaged from the pinions 10 and 80, respectively,the shoes 28-and 29 maybe readily adjusted manually for the purpose ofsetting up the rest for a given Work piece by actuation of the knobs 3|and 38, respectively. The cylinder 14 is preferably adjustably mountedon the steadyrest frame 26 by means of a pair of screws I20 and I2I. Thescrew IZIlserves as a pivot stud for the cylinder 14 and associatedparts. The screw I2I passes through an elongated slot I22 formed in thecylinder block. It will be readily apparent from the foregoingdisclosure that by loosening the screws. I20 and I2I, the cylinder blockI4 may be readily swung in a clockwise direction so that the rack :bar1| is thrown out of engagementwith thepinion I0, after which thesteadyrest shoe 28' may be readily adjusted by manual rotation of theknob 3| Similarly, the cylinder block 84 is adjustably mounted on theframeEli by means of a .pair of screws I24 and I25. The screw'I24eserves as a pivot stud; The screw I25 passes through an elongatedslot I26 in the cylinder, "block-.34. It will be readilyapparentfrom-:the foregoingidisclosure that when it is desired to disconnect therack bar 8|, the screws. 124 and I25 may be loosened, after which thecylinder-block 84may be swung in at clockwise-direction to disengage therack bar ill from the pinion 8E1, th'us allowing a manual adjustment ofthe steadyrest shoe 29 by rotation of the actuatingrknobBB'.

The: fluid pressure actuation of. the .screws 32 and .33'may be readilytimed with the other operating mechanisms of the machine by connectingthe. passage IIU (Fig. 8) so that fluid will beadmitted through thepassage H4 in timed relation with the operation of the other mechanismson the grinding machine.

The operation of this improved steadyrest will be readily apparent fromthe foregoing disclosure. Assuming, adjustments have previously beenmade,.a work piece I2 is placed in position on themachine and fluidunder pressure is admitted through the pipe 62 into the cylinder chamber63 to move the piston 60 toward the left (Fig. 1) so as to swing the arm45 in a clockwise direction into the position illustrated in'Fig. 1 sothat the steadyrest frame 26 is swung upwardly to anoperating position.The grinding wheel II may then be fed into grinding engagement withthework to rough grind or round up the surface of the work. I 2, afterwhich the trip levers 92 and EUZr-may beactuated to release thecompression ofrthe springs I1 and 81, respectively, which serve in themanner above described automatically to rotate the-screws 32 and 39 tomove the shoes 28 and 29, respectively, into operative engagement withthe surface of the work piece I2 and to maintain the shoes in operativecontact therewith at a desired pressureas the work piece I2 is reducedinsize due to grinding. If desired, the

. lower work steadying shoe 29 may be moved into engagement with thework piece I2 before the horizontal shoe 28 is moved into engagementtherewith by trippin the latch so as to release the compression of thespring 81 before the compression of the spring 'Ilis released. Or, ifdesired, the. horizontal shoe 28 similarly may be moved into engagementwith the work piece I2 prior to the movement of the lower shoe 29 intoengagement therewith.

After a grinding operation has been completed, fluid under pressure maybe passed through the pipe 64 into the passage H0 in the steadyrest baseI5 through the chamber II2 surrounding the stud 21, through the centralbore II I, and into the passage II3 surrounding the stud 21, and thenthrough either the passage I I4 or II5 into the cylinder I4 and throughthe passage I IB to the cylinder 84 to actuate the pistons 73 and 83,respectively, to turn the pinions I0 and 8|] in a counterclockwisedirection so as to move the steadyrest shoes 28 and 29 out of operativeengagement with the work piece I2 and to.return-them to their initialposition ready for the next grinding operation.

When fluid under. pressure is admitted through the pipe 64, due to thefact that less pressure is required to actuate the pistons I3 and 83,the steadyrest shoes 28 and29 are first moved out of operativeengagement with thework piece I2, after which fluid passing through thepipe 64 into the cylinder chamber 65 serves to swing the steadyrestframe to an inoperative position.

It willthus be seen that there has'been provided by this inventionapparatus in which the Various objects. hereinabove set forth togetherwith many thoroughly practical advantages are successfully achieved. Asmany possible embodiments may be made of the above invention and as manychanges might be made inthe embodiment above set'forth, it is to beunderstood that all matter hereinbefore et forth'or shown in theaccompanying drawings is to be interpreted as illustrative and not in alimiting sense.

I claim: 1. .In a grinding'machine having a steadyrest comprising asteadyrest base, a pivotally mounted steadyrest frame, a work steadyingshoe adjustably mounted on said frame, means to adjust said shoerelative to said frame, means including a movable arm engagable withsaid frame, slidable connections between said arm and said frame, meanto move said arm to move the frame and steadyrest shoe to and from anoperative position, and means automatically to move said shoe, adjustingmeans automatically to feed and maintain said shoe in engagement withthe work during a grinding operation.

2. In a grinding machine having a steadyrest comprising a steadyrestbase, a pivotally mounted steadyrest frame on said base, a stud on saidbase which serves as a pivotal support for said frame, a work steadyingshoe adjustably mounted on said frame, means to adjust said shoerelative to said frame, means including a pivotally mounted arm having aroller engageable with said frame, means to swing said arm to move theframe and steadyrest shoe to and from an operative position, and meansautomatically to actuate said shoe adjusting means automatically tomaintain said shoe in engagement with the work during a grindingoperation.

3. In a grinding machine having a steadyrest comprising a steadyrestbase, a pivotally mounted steadyrest frame on said base, a studsup-ported on said base which serves as a pivotal support for saidframe, a work steadying shoe adjustably mounted on said frame, meansincluding a nut and screw mechanism to adjust said shoe relative to saidframe, means including a pivotally mounted arm having a rollerengageable with said frame, means to swing said arm to move the frameand steadyrest shoe to and from an operative position, and meansautomatically to actuate said nutand screw mechanism automatically tomaintain said shoe in engagement with the work during a grindingoperation.

4. In a grinding machine having a steadyrest comprising a steadyrestbase, a pivotally mounted steadyrestframe on said base, a stud supportedon said base which serves as a pivotal support for said frame, a worksteadying shoe adjustably mounted on said frame, means including a nutand screw mechanism to adjust said hoe relative to said frame, meansincluding a pivotally mount ed arm having a roller engageable with saidframe, means to swing said arm to move the frame and steadyrest shoe toand from an operative position, andmeans including a spring operativelyconnected to actuate said nut and screw mechanism automatically tomaintain'said shoe in engagement with the work during a grindingoperation.

5. In a grinding machine having a steadyrest comprising a steadyrestbase, a pivotally mounted steadyrest frame onsaid base, a stud supportedby said base which serves as a pivotal support for said frame, a work'steadying shoe adjustably supported on said frame, means including anut and screw mechanism to adjust said shoe relative to said frame,means including a pivotally mounted am having a roller engageable withsaid frame, means including a piston and cylinder operatively connectedto swing said arm to move said frame and steadyrest shoe to and from anoperative position, means automatically to actuate said nut and screwmechanism to move said shoe into operative engagement with the work andto maintain the shoe in operative engagement therewith during a grindingoperation, and means automatically to rotate said shoe adjustoppositedirection to reposition grinding operation has been ing screw in the theshoe after a completed.

6. In a grinding machine having a steadyrest comprising a steadyrestbase, a pivotally mounted steadyrest frame on said base, a studsupported by said base which serves as a pivotal support for said frame,a work steadying shoe adjustably supported on said frame, meansincluding a nut and screw mechanism to adjust said shoe relative to saidframe, means including a pivotally mounted arm having a rollerengageable with said frame, means including a piston and cylinderoperatively connected to swing said arm to move said frame andsteadyrest shoe to and from an operative position, means including aspring au-' tomatically to actuate said nut and screw mechanism to movesaid shoe into operative engagement with the work and to maintain theshoe in operative engagement therewith during a grind-. ing operation,and means including a piston and cylinder automatically to rotate saidshoe adjusting screw in the opposite direction to re-position the shoeafter a grinding operation has been completed.

'7. In a grinding machine having a steadyrest, a steadyrest base, apivotally mounted steadyrest frame on said base, a work steadying shoeadjustably supported on said frame, means including a manually operablemechanism to adjust said shoe relative to said frame, a pivotallymounted arm having a roller engageable with said frame, means to swingsaid arm to move said frame and steadyrest shoe to and from an operativeposition, normally latched means which is arranged to actuate said shoeadjusting mechanism in one direction to maintain the shoe in operativeengagement with the work during a grinding operation, means including apiston and cylinder to adjust said shoe adjusting mechanism in theopposite direction to reposition the shoe after a grinding operation hasbeen completed, and a manually operable latch on said steadyrest frameto release said normally latch means automati- 'cally to move the shoeinto engagement with the work and to maintain it in engagement therewithduring a grinding operation.

8. In a grinding machine having a steadyrest, a steadyrest base, apivotally mounted steady-- rest frame on said base, a work steadyingshoe adjustab-ly supported on said frame, means including a! manuallyoperable nut and screw mechanism to adjust said shoe relative to saidframe, a pivotally mounted arm having, a roller engageable with saidframe, means including a piston and cylinder operativelyv connected toswing said arm to move said frame and steadyrest shoe to and from anoperative position, a normally latched spring which is arranged to turnsaid shoe adjusting screw automatically in one direction tomove the shoeintooperative engagement with the workand to maintain the shoe meansincluding a piston and cylinder to rotate said shoe adjusting screw inthe opposite direction to re-position the shoe after a grindingoperation has been completed, and a manually operable latch on saidsteadyrest frame to release said spring automatically to allow thespring to move the shoe into operative engagement with the work.

9. In a grinding machine having a steadyrest, a steadyrest frame, apairof work steadying shoes adjustably supported on said frame, anindependent nut and screw mechanism independin operative engagementtherewith during a grinding operation,

11 ently: to adj ust-each: of said' shoes relative: toasaid frame, meansincluding an independent normal.- ly latched spring independently toactuatereach of said screws to move thesshoesinto operative engagementwith the work an'dito-maintain them in engagement therewith during agrinding :operation, means including an .independent piston and.cylinder to rotate. said shoe adjusting. screws inthe opposite directionindependently-to lie-position said shoes after a grinding operation hasbeencompleted, .andaepair of independently op-- erated,.manuallyoperable latches onxsaidsteadyrest frame to. release said springsautomatically to allow said springs. independently 'to move-thesho'esinto engagement with the workxancl to maintain them in engagementtherewith during a grinding operation.

10., In a grinding machine. having a steadyrest comprising "a steadyrestbase, a pivotally mounted steadyrest-frame onzsaid base, a studsupported on said-base which serves; as apivotal supporttforsaid; frame,a pair of-.-Worksteadying shoes .adjustablymounted on said frame, meansincluding an independent nut and-screw :mechanism to adjust each of saidshoes relative to. said frame, means including a-pivotally mounted armhaving a. roller engageable with said frame, means-to-swing said arm tomove the frame and steadyrest shoes to and from an operative position,means including a spring operatively con.- nected :to actuatesaid nut'and screw mechanism automatically to move said shoes into engagementwith said Work and to maintain said shoes in operative-engagement withthe work during'a grinding operation, anda manually operableadjustingknob -oneach ofsaid shoe adjusting screws-whereby thepressure-oftheshoes against the work; ;may be manually increased or decreasedasdesired.

11-. Ina grinding machinehaving a steadyrest, a steadyrest frame,.-a-.pair. of work steadyingshoes adjustablyisupportedon said frame,anindependent nut and screw mechanism independently to adjust each ofsaid'screws relativeto said frame, an: independent rack and gearmechanism independently to-rotate each ofsaid screws, means including anindependent normally latched spring independently to actuateeachof saidrack and pinionstomovesaid shoes into operative engagement with the workand to-maintain themv in engagement therewith during a. grindingoperation, means including an independent pistonand cylinder to rotateeach of said shoe adjusting screws inthe opposite directionindependentlyto re-position; saidshoes after a. grinding operationhasbeencompleteda manuallyoperableknob on eachof said. shoe adjustingscrews, and means for disconnecting each. of said rack and pinions sothattheshoe adjusting screwsmay be manuallyadjusted. to position both ofthe work. shoes 'relativeto said frame.

.12.. In a grinding machine havinga steadyrest, a steadyrest basaapivotally mounted steadyrest Lframeonsaid base,.a.pair.oi work steadyingshoes .adiustably, supported onsaidlframelmeans'includ- Number ing anindependent manually operable-mat; and screw mechanismindependently.toadjust eachzof said shoes relative to said frame, a pivotally mountedarm having -a roller engageable with said frame, means including apiston and cylinder operatively connected to swing :said :arm to movesaid frame and steadyrest shoes to and from an operative position,independent spring :actuated means independently to turn said shoeadjusting screws automaticallyin one direction to move the shoes intooperative engagement with the workv and to-maintain the'shoes inoperative engagement, therewith during a grinding .operation, meansincluding an independent piston and cylinder to rotate each, of saidshoe adjusting screWsin-the, opposite direction .to re-position-theshoes after a grinding operation has been completed, and. fluid pressureinterconnections, be.- tween theframe actuating cylinder and theishoerte-positioning cylinders. whereby the. shoes are automaticallywithdrawn from engagement with the Work beforethe steadyrest frame isswung to an, inoperative position.

13. In a grinding machine having a steadyrest, a steadyrest base,apivotally mounted steadyrest frame on said base, a pair of worksteadying shoes adjustably supported on said frame, apivotallymounted'arm having a roller engageable with: said frame, meansincluding a piston and cylinder operatively connected to swing. said armto move saidjframe and steadyrest shoesato-and. from an operativeposition, an independent nutand screw -mechanismindependently toadjusteach-of. saidshoes relative to said frame, ,meansincluding anindependentnormally latched spring independentlyto actuate each .of said. screws tomove the shoes .into operative; engagement. with, the work and tomaintain them. in engagement. therewith during a grinding operation;meansincluding an independent pistonand cylinderv to rotate saidshoeadjusting screws v the. opposite-direction independently torepositionisaid shoes after a grindingoperationhas been completed, andapair .of independently operated, manually operable latcheson saidsteadyrest-frame to .releasesaid springs. automatically .to allow. said.springs .independently to. move. the shoes into. engagement withthe.work .and..to maintain, them n. engagement therewith duringagrinding-operation.

HERBERT A., SILVEN.

REFERENCES CITED The following references are of record, in the file of'this patent:

UNITED STATES PATENTS Name I Date Landis Sept. 27, 1904 Hollengreen-.June 16,1942 ,Smith et. al. ,May- 29, 1934 FOREIGN PA'IENTS Countryv.Date Germany May 2, 1911 Number

